Selenium IDE v1.0.11 NOT Support Changing Formats

Selenium IDE V1.0.11:

It is not supporting Changing formats option...

Format option is Grayed out in Version 1.0.11...

How to Enable it or any alternative to convert the HTML code to desired format..

How to Enable format Option...

Open the Options dialog and turn on the Enable experimental features option. 

Once you turn on the experimental features, you should be able to get formats working again. The Format menu item in the Options menu will no longer be greyed out.

Format

Actually Selenium Experts are not recommending to enable this feature, because it is still under development.  

Alternative way:

Recommended way is to convert your tests to another language is to use the export feature of Selenium IDE.

Export Test Case As menu item in the File menu.

Hope it is useful...